Seagrass habitats are very important to the ecological functioning of coastal lagoons and
estuaries because of their value as refuge for larvae and juvenile fish, as sediment
stabilizers, and as food for waterfowl. Seagrasses live rooted in sediments that are anoxic
most of the time. The requirement to supply oxygen to root tissues places high demand
on the plant for photosynthetically produced oxygen, and hence, a high requirement for
photosynthetically active radiation (PAR). Literature reviews comparing observed depth
limits of submerged macrophytes with various estimates of water transparency have indicated that deep edges of grass beds extend to depths at which 10–30% of surface
irradiance penetrates (Duarte, 1991; Kenworthy & Haunert, 1991; Dennison et al.,
1993).
Seagrass habitats are very important to the ecological functioning of coastal lagoons and
estuaries because of their value as refuge for larvae and juvenile fish, as sediment
stabilizers, and as food for waterfowl. Seagrasses live rooted in sediments that are anoxic
most of the time. The requirement to supply oxygen to root tissues places high demand
on the plant for photosynthetically produced oxygen, and hence, a high requirement for
photosynthetically active radiation (PAR). Literature reviews comparing observed depth
limits of submerged macrophytes with various estimates of water transparency have indicated that deep edges of grass beds extend to depths at which 10–30% of surface
irradiance penetrates (Duarte, 1991; Kenworthy & Haunert, 1991; Dennison et al.,
1993).
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